Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology
Recently, the veracity of the published chronology for the Pliocene section of North Atlantic Ocean Drilling Program Site 982 was called into question. Here, we examine the robustness of the original age model as well as the proposed age model revision. The proposed revision is predicated on an appa...
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ftdoajarticles:oai:doaj.org/article:3d8fdf4b563a4f50a6984634f8359acb 2023-05-15T17:31:18+02:00 Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology K. T. Lawrence I. Bailey M. E. Raymo 2013-10-01T00:00:00Z https://doi.org/10.5194/cp-9-2391-2013 https://doaj.org/article/3d8fdf4b563a4f50a6984634f8359acb EN eng Copernicus Publications http://www.clim-past.net/9/2391/2013/cp-9-2391-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-9-2391-2013 1814-9324 1814-9332 https://doaj.org/article/3d8fdf4b563a4f50a6984634f8359acb Climate of the Past, Vol 9, Iss 5, Pp 2391-2397 (2013) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2013 ftdoajarticles https://doi.org/10.5194/cp-9-2391-2013 2022-12-31T13:11:30Z Recently, the veracity of the published chronology for the Pliocene section of North Atlantic Ocean Drilling Program Site 982 was called into question. Here, we examine the robustness of the original age model as well as the proposed age model revision. The proposed revision is predicated on an apparent misidentification of the depth to the Gauss–Matuyama (G/M) polarity chronozone reversal boundary (2.581 Ma) based on preliminary shipboard paleomagnetic data, and offers a new chronology that includes a hiatus between ~3.2 and 3 Ma. However, an even more accurate shore-based, u-channel-derived polarity chronozone stratigraphy for the past ~2.7 Ma supports the shipboard composite stratigraphy and demonstrates that the original estimate of the depth of the G/M reversal in the Site 982 record is correct. Thus, the main justification forwarded to support the revised chronology no longer exists. We demonstrate that the proposed revision results in a pronounced anomaly in sedimentation rates proximal to the proposed hiatus, erroneous assignment of marine-isotope stages in the Site 982 Pliocene benthic stable oxygen isotope stratigraphy, and a markedly worse correlation of proxy records between this site and other regional paleoclimate data. We conclude that the original chronology for Site 982 is a far more accurate age model than that which arises from the published revision. We strongly recommend the use of the original chronology for all future work at Site 982. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Climate of the Past 9 5 2391 2397 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 K. T. Lawrence I. Bailey M. E. Raymo Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Recently, the veracity of the published chronology for the Pliocene section of North Atlantic Ocean Drilling Program Site 982 was called into question. Here, we examine the robustness of the original age model as well as the proposed age model revision. The proposed revision is predicated on an apparent misidentification of the depth to the Gauss–Matuyama (G/M) polarity chronozone reversal boundary (2.581 Ma) based on preliminary shipboard paleomagnetic data, and offers a new chronology that includes a hiatus between ~3.2 and 3 Ma. However, an even more accurate shore-based, u-channel-derived polarity chronozone stratigraphy for the past ~2.7 Ma supports the shipboard composite stratigraphy and demonstrates that the original estimate of the depth of the G/M reversal in the Site 982 record is correct. Thus, the main justification forwarded to support the revised chronology no longer exists. We demonstrate that the proposed revision results in a pronounced anomaly in sedimentation rates proximal to the proposed hiatus, erroneous assignment of marine-isotope stages in the Site 982 Pliocene benthic stable oxygen isotope stratigraphy, and a markedly worse correlation of proxy records between this site and other regional paleoclimate data. We conclude that the original chronology for Site 982 is a far more accurate age model than that which arises from the published revision. We strongly recommend the use of the original chronology for all future work at Site 982. |
format |
Article in Journal/Newspaper |
author |
K. T. Lawrence I. Bailey M. E. Raymo |
author_facet |
K. T. Lawrence I. Bailey M. E. Raymo |
author_sort |
K. T. Lawrence |
title |
Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology |
title_short |
Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology |
title_full |
Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology |
title_fullStr |
Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology |
title_full_unstemmed |
Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology |
title_sort |
re-evaluation of the age model for north atlantic ocean site 982 – arguments for a return to the original chronology |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/cp-9-2391-2013 https://doaj.org/article/3d8fdf4b563a4f50a6984634f8359acb |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Climate of the Past, Vol 9, Iss 5, Pp 2391-2397 (2013) |
op_relation |
http://www.clim-past.net/9/2391/2013/cp-9-2391-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-9-2391-2013 1814-9324 1814-9332 https://doaj.org/article/3d8fdf4b563a4f50a6984634f8359acb |
op_doi |
https://doi.org/10.5194/cp-9-2391-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
5 |
container_start_page |
2391 |
op_container_end_page |
2397 |
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1766128810846060544 |